Tubular burner



May 13, 19301 R. THURM ET A1..

' TUBULAR BURNER iled oct. i5, 1925 :5 shee'tsfsheet 1 w .Sk

A TTORNEYS.

Y May 13, 1930. R. THURM ET Ax.

TUBULAR BURNER Filed Oct. 15, 1925 5 Sheets-Sheet 2 1 INV N'ToR.

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ATTORNEYS.

May 13, 193m 8 2 M, 5 N 7 e 0 1 T S A L e e n.. S L 5 A m m mv hw n m lM B N o o U o m m t. o o \o o o o ww C .I J 11` .nl J l. l. l .1 l. 1..l l .l 1... ..l 1.. ...l1 1 .I H UD 0 1 .1 1 1 11 1 1 w 1 1 11.1 1 F11.1 1 1 1 R m .S N Vi H 3 1 /\l 1 1 Mw w 1 1 1 1 1 1 1 1 1 1 1 1 1 |1|1\|1 1 11.! RR a .l .1. .1. 1 v mw E HUM 1111111 1 1@..11U1|11.111 Wm HH11 MOH1H111111 1H111111 MHH H11OU1111111H1111M M H H u Wm H @wwwPatented May 13, 1930 UWE 12;

4RICHARD THURM AND EUGEN'E OSSCAR ENGELS, OF SAGINAW, MICHIGAN,ASSIGNORS T BAKER-PERKINS COMPANY, INC., OF NEW YORK, N. Y., ACORPORATION OF NEW TUBULAR BURNER Application led October 15, 1925.'Serial No. 62,511.

This invention relates to burners for illuminating gas, producer gas,water gas, vaporized oils and similar gaseous fuels, and particularly tothe long tubular burners which are used for burning mixtures ofgaseous'fuels and air in substantiallyoxygen free vatmospheres as, forexample, in baking ovens. When the ordinary long tubular burner suppliedwith a combustible mixture of air and gaseous fuel is located so thatthe combustion at its outlets takes place in a more or less conlinedspace in'an atmosphere that is substantially free from or at leastdeficient in oxygen and raised to a comparatively high temperature,there is liability to obJectionable and 'Sometimes dangerous back-iirnand explosions.

An object of the present invention is to" provide a burner soconstructed as to pre-- vent such backtires and explosions and to insurea continuous and substantially uniform combustion throughout the lengthsof the burners.

Reference is had to the accompanying drawings showing variousembodiments of the invention in which Y y Figure 1 shows a burnerconstructed in accordance with the present invention, the view being inside elevation.

Figure 2 is a vertical sectional view through the'burner takenapproximately on the line 2-2 of Figure 1.

Figure 3 is a top plan view of one end of the burner. i

Figure 4 is a longitudinal vertical sectional View ofthe burner.

Figure 5 is a vertical sectional view taken on the line 5 5 of Figure 4.

Figure 6 is a. view in elevation of one of the elements of the burner. I

Figure f7 is a vertical sectional view of a slightly modified form ofthe invention.

Figure 8 is a top plan view of the modified form of the invention shownin Figure 7.

Figure 9 is a longitudinal sectional view of a stillfurther modifiedform of the invention.

Figure 10 is a vertical sectional view of the form of the burner shownin Figure 9 the view being taken in a plane at right angles 50 to saidFigure 9.

Figure 11 is a vertical sectional view of that form of the inventionshown in Figure 9, and taken on the line 11-11 of said Figure 9.

Figure 12 is a detail bottom plan view of 55 a portion of the burneremployed in the Inodified form of the invention shown in Figures 9 to 12inclusive.

Figure 13 is a longitudinal sectional view of a still further modifiedform of the invention, and l Figure 14 is a vertical sectional viewtaken on the line 14-14 of Figure 13.

Referring more specifically to the drawings, and particularly to Figure1 the referencev character 25 designates a burner of the type known astubularf In bakers ovens, and in similar heating apparatus several ofthese burners are employed and in such an installation each burner isconnected, by means of a pipe section 26, with a gas supply main 27.Each pipe section 26 is preferably provided with a valve 29 by means ofwhich individual operation of the burners may be controlled. The gas issupplied to the main 75 27 by a suitable mixing apparatus 28 whichserves to supply to the gas the proper amount pf air to insure anefcient combustible mixure.

In the present embodiment of the invention, these burners extend fromthe rear wall 30 through the frontlwall 32 of the chamber to be heatedand, aiding in the support of said burners 25, there are cross members31 which in the present instance are in the form of channel irons. Thefront wall of the chamber ispreferably provided adjacent to 'each burnerwith an observation door 33 by means of which the burner may be fromtime to time inspected as to its operation.

The burner 25 comprises a suitable conduit, such as a tube preferablycircular in crosssection, and said tube is provided with a slot 44extending throughout the major portion ofthe length thereof. Mountedwithin the burner 25 is a second tubular member 34 which is preferablysubstantially semi-circuvlar in cross-sectional form and is positionedin the burner 25 with its flat wall extending across the diameter of theburner 25 and with 100 its curved wall conforming tov the curved wall ofthe burner 25, as is clearly shown in Fi ures 2 and 7.

t is this inner tube 34 which receives the gas from'the main 27 anddelivers the gas through the Hat wall thereof to the tubular burner 25,the flat wall bein@r formed with a plurality of perforations 41 iiorthis purpose. Carried by the outer end of each burner is a coupling,which coupling 'comprises two flanged collars 39 and 40 which havethreaded connection with the burner 25 and the pipe section 26 resectively. Interposed between the flanges-of) these collars 39 and 40 isa plate 37, which, in turn, has an opening of a shape corresponding tothe cross-sectional shape of the inner tube 34. This opening receivesthe end of the inner tube 34, which latter is flanged as at 38 for therece tion of securing meanspreferably in the form of rivets 38 whichserve to secure the inner tube` 34 to the plate 37.. Suitable bolts 39pass through the flanges of the flanged collars 39 and 40 and a suitablepacking 40 may be employed if desired.

' Xtending transversely of the burner 25 are bolts 42, which bolts arespaced with respect to one another, and are so positioned .as to overliethe inner tube 34, One end 0f there are` two of these check bars 45.ar-,

ranged in spaced relation to each other.

Positioned betweenV the check bars 45 is a bar 50 which is maintained inspaced relation with respect to these `check bars by means of a wire 49wound 'spirally around the -bar I50 in such a manner that when said baris in place between the check bars 45 passages 52 etween the'wire, thebar 50l and the check bars' 45 are provided which passages permit of afree flow of the fuel from` theburner. This assemblage, that is thecheck bars 45 and the bar 50 is retained in assembled relation by meansof rivets ,or the like 51 andis retained in position within the slot 44of the burner 25 by means of a pluralit of over- V lying lingers 46 andby a tightemng of the nuts 43 on their bolts 42 which latter causes acontraction of the slot 44 suiicient to move the sides of said ,slotinto engagement with the check bars 45 and form a tight jointtherewith.' At each end of the burner 25 there is a plate 47 secured tosaid burner by cap screws or other suitable fastening means 48 and thisplate is shaped to conform to the eaterior of the .burner 25. By meansof this plate 47, escape of fuel around the check l bars at'the ends ofthe slot is prevented.

' When a burner havinga double flame is desired, a construction such asshown in Fighereto ore jdescribed form of the invention. Y i rThe twobars 53 and 54 are positioned within the slot 44 of the tubular member25 of the burner, it being understood that the slot 44 in theftubularmember 25 in this form of the invention is of greater width than in thepreviously described form of the invention and of suflicient width toaccommodate the two bars 53 and 54, a spacing bar 55 and the two checkbars 45. The check bars 45, the two bars '53 and 54,and the spacing bar55 are secured together in a unitary structureby suitable fasteningmeans illustrated in the present instance as rivets 56, and this entireassemblage is retained in the tubular member 25 of the burner by thecurved fingers 46 and the plates 47 heretofore mentioned.

In Figures 9 to 12 inclusive is shown a still` further modified form ofthe invention in which the inner tube 34 is dispensed with, the dasentering the tubular burner 25 direct. In t is form of the invention,the check bars 57 are spaced by a bar 60 around which the wire 49 iswrapped to provide passages 62, and these parts are secured in thisrelation by suitable fastening means such as rivets 64.

In order to provide a chamber between the check bars 57 and bar 60,-which chamber is designated by the reference numeral 61, the

bar 60 is relatively narrower than the check' bars 57 and has its upperedge positioned flush with the upper edges of the vcheck bars 57. Thebottom wall of the chamber 61 is .formed by a plate 59 secured to thecheck .bars 57 as at 58, and to permit of gas entering this chamber 61the plate 59 is formed with a plurality of openings 63. In' this form ofthe invention the assemblage comprising the check bars 57 and bar 60 arefixed together 4by rivets 64 and secured in position in vthe slot 44 ofthe tubular member 25 by the fingers 46 and plates 47 in the same manneras heretofore described, and for the purpose of closing the ends of thechamber 61 plates 65` are provided.

In Figures 13 and 14,-a still further modil fied form of the inventionis shown in which the check bars 66 are formed with a plurality ofopenings 67. The bar 69 around which the wire 49 is wrapped to providefuel passages 73 is of such a width or depth that its lowei` edge willoccupy a position above the openings '67 and will therefore not obstructthe nvaaeae 3 passage of fuel therethrough. This bar 69 is held inposition between the bars 66 by means of rivets or other suitablefastening means designated by the reference numeral '70. A bar 71 issecured between the inner edges of the check bars 66 by suitablefastening means which in the present instance is illustrated as rivets72 and this constructign provides a chamber 68 which has communicationwith the interior of the tubular member 25 through the openings 67 inthe bars 66.

ln those forms of the invention in which the bar about which the wire 49is wrapped is relatively narrow, the Wire is so wrapped' that itpresents a greater number of convglutions in a given length than is thecase where this bar is of greater width thus providing relatively7narrow channels which are designated by the numeral62 in Figure 9 andthe numeral 73 in Figure 13.

lt will be observed that in each of the embodiments above illustratedthe tube 25 is one form of a `conduit for gas and the like, which has anelongated opening therein, preferably but not necessarily formed asanarrow slot, and that this slot is provided with side walls which in thepreferred embodiment are at least in part located within the slot andare spaced apart considerably less than their width, so that when thereis inserted between them mechanism, in any of the various forms shown,which form gas passages at the exterior surface, each of these passagesis narrowand relatively long from inside thetube i outward, so that thegas has to pass a distance considerably greater than that between theplates, before issuing at its burning point. The distance between theplates may be whatever seems feasible in the particular installation andwith the particular kind of gas and pressure existing. No specific sizesfor all the various conditions are necessary here as these will dependon conditions present. But the arrangement shown results' in formswhich'experience has determined will substantially prevent all danger ofback firing and at the same time will insure a burner construction whichwill serve to maintain in operation the gas ames in spite of the heavysteam or moisture often present in baking ovens of this character.

While we have described above various embodiments of our invention, werealize that it may be embodied in widely diierent forms other thanthose shown. We, therefore, do not limit ourselves to the particularconstructions illustrated and described herein.

What is claimed as new is:

l. A gas burner comprising a conduit having an elongated openingtherein, an elongated bar mounted in said opening, a spacing strip woundabout said bar, and surfaces enaging the stri onfeach side of the bar tororm a series o gaspas'sages on each side of said bar.

2. A gaseous burner comprising a conduit for gas and the like having aslot therein, side plates located in said slot and spaced from eachother, a passage-forming means between said plates comprising a bar anda strip wound about saidbar thereby forming a series of gas passages oneach side of said bar.

3. In a gaseous fuel burner, a chamber having an elongated slot 'formedtherein, two elongated plates extending along said slot and projectingwithin the burner, a third elongated plate interposed between the firsttwo plates and a length of wire wrapped about said third plate in spiralform to maintain the same in spaced relation to the rst two plates so asto provide a plurality of individual fuel passages on each side of thethird plate between the same and the first two plates.

4. A gaseous fuel burner comprising a tubular member having an elongatedopening, two spaced elongated bars extending along said opening andprojecting within the conduit, a third bar of less width mounted betweensaid lirst two bars, the first two bars extending beyond the third barwithin the conduit, spacing means interposed between the third bar onopposite sides thereof to space the same from the first two bars, a barextending along the inner margins of the first two bars to form achamber between the same, and means for delivering gas from the conduitinto said chamber.

Signed at Saginaw, Michigan, this 9th day of October, 1925.

RCHRD THURM. EUGENE OSCAR ENGELS.

